Device for truing commutators.



No. s6o,s|a. Patented ont. so, |900.

y P. B. nswonrn. Y

DEVICE FUR TBUING CDMMUTATORS.

[Application led Aug. 10, 1900.)

(No Model.)

ZZ'HC 8s es: Invenor:

UNTTED STATES PATENT OFFICE.

PEROY B. BOSWORTH, OF AKRON, OHIO, ASSIGNOR OF ONE-HALF T FRANK G. CARNAHAN, OF SAME PLACE.

DEVICE FOR TRUING COMMUTATORS.

SPECIFICATION forming part of Letters Patent No. 660.618, dated October 30, 1900. Application tiled August l0, 1900. Serial No. 26,516. (No model.)

To n//Z whom t may concern: the box cover bolt, it being immaterial Be it known that I, PEROY B. BOSWORTH, a whether the cap is removed entirely or only o citizen ofthe United States,residing at Akron, a single bolt and the post passed through the in the county of Summit and State of Ohio, bolt-hole in the cap. The shaft is provided 5 have invented a certain new and useful Imwith a square or polygonal top to facilitate provement in Devices for Truing Comuiutathe operation. On the post 6 isan adjustable tors, of which the following is a specication. vertical split sleeve 7, secured by a holt 8, in- 55 Myinvention has relation to improvements tegral with which is a transverse horizontal in devices for truing commutators for dynasplit sleeve 9, adapted to be compressed by a to mos and electric motors that have become bolt l0. In the sleeve 9 is a horizontal shaft worn or irregular in contour by the attrition 11, having a horizontal feather-groove l2. On of the brush. the shaft 1l is fitted to slide a sleeve 13, hav- 6o Myinvention specially pertains to that class ing a feather 14, adapted to slide in the of devices in which a file is used to true the groove 12, and having a radial arm 15, procom mutator; and it has for its object the provided with parallel wrists 16 17, on which are duction of a simple and effective device by freely mounted rollers 18 19, respectively. which a person unskilled in the use of the file These rollers form friotionless guides for a 65 may accurately true the commutator. file 20, by which the commutator is to be To the aforesaid object my invention contrued. zo sists in the peculiar and novel construction, In operation the file 2O is passed diagonally arrangement, and combination of parts herebetween the rollers 18 19, the arm 15 being inafter described, and distinctively pointed given the proper inclination to have it bear 7o out in the claims, reference being had to the on the commutator and reciprocated lengthaccompanying drawings, which constitute a Wise by hand as the commutator is revolved part of this specification. on its shaft. In this process the sleeve is In the accompanying drawings, in which moved along the shaft ll until all inequalisimilar'reference-numeralsindicate like parts ties of the commutator are filed and it is ac- 75 in the different views, Figure 1 is a front curately trued. elevation of my device; Fig. 2, an end ele- Where from the size of the commutator the 3o vation looking from the left of Fig. 1 with foregoing apparatus will not give the proper the coverof the armature-shaft box removed; angle for the file, the post 6 instead of being Fig. 3, a plan of the lower half of the armasecured directly in the bolt-hole in the lower 8o ture-shaft box, showing the adjustable link box of the armature-shaft is fastened in a for securing the desired angle of the fileslotted plate 21, which is adjustably held by guides; and Fig. 4, an end elevation from the a holt 22, which enters the bolt-hole aforeleft of Fig. 1 to illustrate the manner of apsaid. By this arrangement the apparatus is plyingr the adjustable link. readily adapted to truing comm utators of a Referring to the figures, 1 is the armaturegreat variety of sizes. shaft, and 2 the commutator. The shaft 1 I claim as my invention- 4o rests in the lower box 3 and is held in posi- 1. In a commutat-or-truiugdevice, the comtion in the usual manner by the cap 4. The bination with asupporting-post adapted to be com mutator is represented by the cylindrical secured to the dynamo-housing, of a trans- 9o portion 2, the larger portion 5 at its right beverse shaft adjustably secured to said post, ing the armature-coil. and a radial arm adapted to slide on said 45 In the smaller com mutators the device shaft, secured against rotation thereon and shown in Figs. l and 2 will be employed, and provided with parallel rollers to form file it consists of a post 6, adapted to be screwed guides, substantially as shown and described. into the opening in the housing provided for 2. In a commutator-truing device the combination of a post with a transverse shaft ad- In testimony that claim the abovel herejustably secured thereto bearing a slidingl unto set my hand in the presence oftwo subarm having parallel rollers to form file-A scribingwitnesses.

guides,'andmeans for adjustably securing PERCY B. BOSWORTH. 5 said post to the dynamo-housing at determi- In presence 0fnate distances from the commutator, sub- C. E. I-IUMPHREY,

stantially as shown and described. C. P. HUMPHREY. 

